MAX15026 Datasheet, PDF (3/23 Pages) Maxim Integrated Products – Low-Cost, Small, 4.5V to 28V Wide Operating Range, DC-DC Synchronous Buck Controller

Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
ELECTRICAL CHARACTERISTICS (continued)
(V_IN = 12V, R_RT = 27kΩ, R_LIM = 30kΩ, C_VCC = 4.7µF, C_IN = 1µF, T_A = -40°C to +85°C (MAX15026BETD+), T_A = T_J = -40°C to
+125°C (MAX15026BATD+), unless otherwise noted. Typical values are at T_A = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
ENABLE (EN)
EN Input High
V_{EN_H} V_EN rising
1.14 1.20 1.26
V
EN Input Low
EN Input Leakage Current
V_{EN_L}
I_{LEAK_EN}
V_EN falling
V_EN = 5.5V
0.997 1.05 1.103
V
-1
+1
µA
OSCILLATOR
Switching Frequency
1MHz Switching Frequency
2MHz Switching Frequency
f_SW
R_RT = 27kΩ
R_RT = 15.7kΩ
R_RT = 7.2kΩ
540 600 660
0.9
1
1.1
1.8
2.0
2.4
kHz
MHz
MHz
Switching Frequency Adjustment
Range (Note 3)
200
2000
kHz
RT Voltage
V_RT
1.19 1.205 1.22
V
PWM Ramp Peak-to-Peak
Amplitude
V_RAMP
1.8
V
PWM Ramp Valley
Minimum Controllable On-Time
V_VALLEY
Maximum Duty Cycle
Minimum Low-Side On-Time
OUTPUT DRIVERS/DRIVER SUPPLY (DRV)
f_SW = 600kHz
R_RT = 15.7kΩ
DRV Undervoltage Lockout
V_{DRV_UVLO} V_DRV rising
DRV Undervoltage Lockout
Hysteresis
0.8
V
65
100
ns
85
88
%
75
110 150
ns
4.0
4.2
4.4
V
400
mV
DH On-Resistance
DL On-Resistance
DH Peak Current
DL Peak Current
Low, sinking 100mA, V_BST = 5V
High, sourcing 100mA, V_BST = 5V
Low, sinking 100mA, V_BST = 5.2V
High, sourcing 100mA, V_BST = 5.2V
C_LOAD = 10nF
Sinking
Sourcing
C_LOAD = 10nF
Sinking
Sourcing
1
3
Ω
1.5
4.5
1
3
Ω
1.5
4.5
4
A
3
4
A
3
DH/DL Break-Before-Make Time
Time from high side at 1V to low side at
1V
10
ns
SOFT-START
Soft-Start Duration
2048
Switching
Cycles
Reference Voltage Steps
CURRENT LIMIT/HICCUP
64
Steps
Current-Limit Threshold
Adjustment Range
Cycle-by-cycle valley current-limit
threshold adjustment range
30
valley limit = V_LIM/10
300
mV
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